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Added IMU support for GameSir controllers with optimized sampling rate and timestamp synchronization.

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This commit is contained in:
chenzw
2026-02-10 15:51:35 +08:00
committed by Sam Lantinga
parent 6f1aa78e04
commit 85c297a28b
1 changed files with 9 additions and 2 deletions
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11
src/joystick/hidapi/SDL_hidapi_gamesir.c
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@@ -35,6 +35,7 @@
#define GAMESIR_PACKET_HEADER_0 0xA1
#define GAMESIR_PACKET_HEADER_1_GAMEPAD 0xC8
#define GAMESIR_IMU_RATE_HZ 1000
#define BTN_A 0x01
#define BTN_B 0x02
@@ -335,6 +336,7 @@ static bool HIDAPI_DriverGameSir_InitDevice(SDL_HIDAPI_Device *device)
ctx->led_supported = true;
ctx->output_handle = GetOutputHandle(device);
ctx->sensor_timestamp_step_ns = SDL_NS_PER_SECOND / GAMESIR_IMU_RATE_HZ;
switch (device->product_id) {
case USB_PRODUCT_GAMESIR_GAMEPAD_G7_PRO_8K:
@@ -385,7 +387,9 @@ static bool HIDAPI_DriverGameSir_OpenJoystick(SDL_HIDAPI_Device *device, SDL_Joy
joystick->nhats = 1;
if (ctx->sensors_supported) {
ctx->sensor_timestamp_step_ns = SDL_NS_PER_SECOND / 125;
// GameSir SDL protocol packets currently don't expose an IMU timestamp.
// Use a synthetic monotonic timestamp at the firmware's fixed IMU rate.
ctx->sensor_timestamp_ns = SDL_GetTicksNS();
// Accelerometer scale factor: assume a range of ±2g, 16-bit signed values (-32768 to 32767)
// 32768 corresponds to 2g, so the scale factor = 2 * SDL_STANDARD_GRAVITY / 32768.0f
ctx->accelScale = 2.0f * SDL_STANDARD_GRAVITY / 32768.0f;
@@ -398,7 +402,7 @@ static bool HIDAPI_DriverGameSir_OpenJoystick(SDL_HIDAPI_Device *device, SDL_Joy
const float gyro_denominator = 16.0f;
ctx->gyroScale = (gyro_numerator / gyro_denominator) * (SDL_PI_F / 180.0f);
const float flSensorRate = 1000.0f;
const float flSensorRate = (float)GAMESIR_IMU_RATE_HZ;
SDL_PrivateJoystickAddSensor(joystick, SDL_SENSOR_GYRO, flSensorRate);
SDL_PrivateJoystickAddSensor(joystick, SDL_SENSOR_ACCEL, flSensorRate);
}
@@ -485,6 +489,9 @@ static bool HIDAPI_DriverGameSir_SetJoystickSensorsEnabled(SDL_HIDAPI_Device *de
SDL_DriverGamesir_Context *ctx = (SDL_DriverGamesir_Context *)device->context;
if (ctx->sensors_supported) {
ctx->sensors_enabled = enabled;
if (enabled) {
ctx->sensor_timestamp_ns = SDL_GetTicksNS();
}
return true;
}
return SDL_Unsupported();